Telephone-receiver.



PATENTED JULY 4, 1905.

'1'. G. BREGHT.

v TELEPHONE RECEIVER. APPLICATION FILED $112122, 1902. nnpnwnn 111:0.14. 1904.

' wesses:

UNTTED STATES Patented July 4, 1905.

PATENT OEEIcE.

TELEPHONE-RECEIVER.

SPECIFICATION forming part of Letters Patent No. 794,137, dated Ju y 4,1905.

Application filed September 22, 1902. Renewed December 14, 1904.. SerialNo. 236,855.

To all whom it may concern:

Be it known that I, THEODORE C. BRECHT, a citizen of the United States,residing at WVashington, in the District of Columbia, have inventedcertain new and useful Improvements in Telephone-Receivers; and I dodeclare the following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itappertains to make and use the same, reference beinghad to theaccompanying drawings? and to the letters of reference marked thereon,which form a part of this specification.

My invention relates to improvements in receivers for telephones; andthe object of the invention is to produce an instrument for receivingthe messages in telephone-lines that is more sensitive and will respondto the sound or voice in a clearer and stronger manner than those now inuse; also, that it will reproduce the vibrations of the transmittinginstrument to the receiving instrument in the same manner and so thatthey will not interfere with each other; furthermore, to increase thesound or voice, whether it be of high or low pitch, by means of acentrally-secured diaphragm on a holding-core, having multiple coils ofwire upon it, as also to place one or more multiple coils in theline-wire to increase the currents, and thus the vibrations ofthediaphragm.

To this end my invention consists in the peculiar construction ofdetails and the novel arrangement of certain parts, as will be morefully described hereinafter, and pointed out in the claims, referencebeing had to the accompanying drawings, and the letters thereon.

Like letters indicate similar parts in the figures, in which- Figure 1represents a front view of the receiver. Fig. 2 is a longitudinalcentral section of the same. Fig. 3 is a detail view, partly in section,of the central core for the diaphragm and slightly-modified fasteningfor said diaphragm.

In the drawings, A represents a cylinder of suitable size, made,preferably, of soft or cast iron and having a flange a at its lower end.This cylinder A is fitted over a wooden cylinder B, which is in turnattached to a metal core C. The main part of the core is of circularform, and its lower part is provided with a collar 0, that bears againsta spider g of the case G, made of proper material, shape, and size. Thecase G is preferably made of three partsz'. 6., the case G proper, themouthpiece L, and the holding-piece M for the hand. The mouthpieceL isscrewed onto the main part G and the holding-piece M to its lower side.To this is secured the cap N with the binding-screws O and P. The core Cis provided with the square part 0', passing through the spider g, andis preferably fitted through a thimble e and prevents turning or wear ofthe core. The screw endb and a nut secures the core firmly in place. Theopposite end'of the core C is slightly reduced to receive the spring f,against which the diaphragm E bears, and serves to increase thesensitiveness thereof, as well as its actions. Said diaphragm E ofsuitable material is held centrally in place by the screw end and nut'5, and by this means said diaphragm can be adjusted and regulated so asto reduce the vibrations of said diaphragm to a minimum, as well as itscontact with the cylinder Ato a nicety. Upon the cylinder A are wound aseries of fine coil-wires D, side by side. At one side the ends (1 ofsaid wires are connected together and then to the line-wire I, whiletheir opposite ends d are connected together and to the battery K. Inthe main line I is arranged a multiple coil H to strengthen the currentand increase its force, and, if desired, two or more of these coils Hmay be arranged at certain intervals, especially in long lines.

In the modification shown in Fig. 3 the diaphragm E is secured in placeby a screw It, that is screwed into the core C, having the square part0' and the screw end I) to secure itin the spider of the case G. Saiddiaphragm E is supported on the spring f and held in place by the screw71, in this instance.

The operation is as follows: When the message is sent from thetransmitter through the line-wire I, the current passes around themultiple coil H, through the core and line-wire, connecting to thereceiving end. The current passes around the cylinder A, whose coils areso connected that their first ends communicate with the line-wire andtheir last ends are connected together and to the battery. Thus saidCylinder becomes magnetized when the line is in use. The vibrations areimparted from the diaphragm of the trans mitter through the line and arereproduced in a much stronger and more distinct manner, and also in thesame manner to the diaphragm of the receiver, as they both will act inperfect accord with each other. The multiple coils serve to increase thestrength of the current and also cause the sound of the voice to beclearer and easier understood than any now in use.

Having thus described my invention, what I claim is 1. In atelephone-receiver, the combination of the metal cylinder, the metalcoils wound thereon, the wooden cylinder, a core, a diaphragm centrallysecured to the core, a spring for supporting the diaphragm,substantially as specified.-

2. In a telephone-receiver, a metal core, a wooden cylinder carriedthereby, adiaphragm centrally secured to said core, in combination witha series of multiple coils, Whose ends are connected together at one endand to the line- Wire, while their opposite ends are connected to abattery, all as set forth.

3. In a telephone-receiver, the combinatio of the metal cylinder, themetal coils wound thereon, the Wooden cylinder, a core, a diaphragmcentrally secured to the core, a spring for supporting the diaphragm,and a series of multiple coils, whose ends are connected together at oneend and to the line-wire, while their opposite ends are connected to abattery, all as herein specified.

In testimony whereof I aflix my signature in presence of two Witnesses.

THEODORE C. BRECHT. Witnesses:

P. V. KEATING, E.- J. KENNEDY.

